This Hellma immersion probe withstands extreme process conditions and due to its monolithic sapphire head this probe is the ideal solution for highest demands.
These probes have a monolithic probe head made of high-purity sapphire (Al2O3). By using a total reflection prism, the light beam passes through the sample only once, as with a cuvette measurement. The stray light is minimised.
Immersion probes with sapphire optics
Product info 661.2300 without flange
| Type | 661.2300 NIR; 661.2302 NIR |
| Sensing head material | Sapphire (Al2O3) |
| Probe barrel material | Stainless steel 1.4571 (316 Ti) or Material 2.4602 (Hastelloy® C-22) |
| Flange | Without |
| Sealing of sensing head | Perfluoroelastomer FFKM (ASTM D1418) Fluoropolymer PTFE (ASTM D1600) |
| Outer-Ø | 20 or 25 mm |
| Total length (inl. SMA socket) | 353 mm |
| Max. immersion depth | 240 mm |
| Typ. transmission | NIR: > 40% in air at 1,500 nm |
| Max. pressure | 35 bar |
| Max. temperature | 260 °C |
| Optic fibre | Firmly installed, can be changed at Hellma NIR 400 nm – 2300 nm (25,000 cm-1– 4.348 cm-1) UV/Vis and UV/Vis low solarisation upon request. |
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Product info 661.2303 with flange
| Type | 661.2303 NIR |
| Sensing head material | Sapphire (Al2O3) |
| Probe barrel material | Stainless steel 1.4571 (316 Ti) or Material 2.4602 (Hastelloy® C-22) |
| Flange | DIN 25 / PN 40 Form A* |
| Sealing of sensing head | Perfluoroelastomer FFKM (ASTM D1418) Fluoropolymer PTFE (ASTM D1600) |
| Outer-Ø | 25 mm |
| Total length | 353 mm |
| Max. immersion depth | 200 mm |
| Typ. transmission | NIR: > 40% in air at 1,500 nm |
| Max. pressure | 35 bar (at max. 100°C)* |
| Max. temperature | 260 °C (at max. 25 bar)* |
| Optic fibre | Firmly installed, can be changed at Hellma NIR 400 nm – 2300 nm (25,000 cm-1– 4.348 cm-1) |
* according to EN 1092-1
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